hi guys : the book is called " a cure for all diseases"
and it is very effective especially in the winter months , if I feel a cold or flu symtoms coming on I'll do 1 session with my zapper and within 2 - 3 hrs the symtoms are gone and are able to avoid another cold or flu , I've built a 12 volt dc version that I can plug into the wall ,but hulda's 9 volt version works just as good , i just got tired of replacing batteries , you might beable to find the diagram online and print out a copy some one in the forum had posted some web sights that had some info and a possible diagram a while back